/Engine/Source/Runtime/Projects/Public/Interfaces/IProjectManager.h
Sets the project's EpicSampleNameHash (based on its filename) and category, then saves the file to disk. This marks the project as a sample and fixes its filename so that it isn't mistaken for a sample if a copy of the file is made.
true if the file was successfully updated and saved to disk
bool SignSampleProject ( const [FString](API\Runtime\Core\Containers\FString) & FilePath, const [FString](API\Runtime\Core\Containers\FString) & Category, [FText](API\Runtime\Core\Internationalization\FText) & OutFailReason )